Trail runners, here’s a race for you. The 13.1-mile Black Squirrel Half Marathon hits the trails of Lory State Park, offering a challenging, yet doable introduction to trail racing. The course covers dirt roads and mostly nontechnical trails, gaining about 2,000 vertical feet. The apex of the course is near the Arthur’s Rock summit at about 7,000 feet. Enjoy the rapid descent on the rolling singletrack trails to the finish at Soldier Canyon Picnic area. Boulder Beer Co. will provide the post-race brews, and there will also be barbecue. Kids can run a free 1K race. The trails will be open to all users that day. Cost is $65; $80 on race day.